Copolymer polyester resin and molded product using same

Abstract

The present invention relates to a copolymer polyester resin and a molded product using the same and more specifically to a copolymer polyester resin that contains 10˜80 mol % of 1,4-cyclohexane dimethanol, 0.1˜30 mol % of a cyclohexane dimethanol compound expressed as HOH 2 C—[C 6 H 12 ] m —[C 6 H 12 ]—CH 2 OH (where m is an integer from 1˜10), and ethylene glycol as the remainder so that the sum of the entire diol composition may be 100 mol % based on an aromatic dicarboxylic acid. The copolymer polyester of the present invention enables superior products to be provided that reduce cycle time and enhance product processability during mold processing using a heat-shrinking label by complementing low temperature shrinkage properties that may be exhibited by the polyester resin of the prior art copolymerized with 1,4-cyclohexane dimethanol.

The invention claimed is: 
     
       1. A copolymer resin useful for a heat-shrinking film, which contains 10˜80 mol % of 1,4-cyclohexane dimethanol, 0.1˜30 mol % of a cyclohexane dimethanol based compound represented by Formula 1 below, and ethylene glycol as a remainder so that a sum of the entire diol composition is 100 mol % based on an aromatic dicarboxylic acid: 
       
         
           
           
               
               
           
         
         wherein m is an integer of 2˜10. 
       
     
     
       2. The copolymer polyester resin of  claim 1 , wherein the diol compound represented by Formula 1 is one or more selected from the group consisting of dicyclohexane dimethanol, tricyclohexane dimethanol, tetracyclohexane dimenthanol, pentacyclohexane dimethanol, and mixtures thereof. 
     
     
       3. The copolymer resin of  claim 1 , wherein the aromatic dicarboxylic acid is terephthalic acid. 
     
     
       4. A molded product, produced by extruding or injection molding the copolymer polyester resin of  claim 1 . 
     
     
       5. The molded product of  claim 4 , wherein the molded product is a heat-shrinking film. 
     
     
       6. The molded product of  claim 4 , wherein the molded product has a shrinkage initiation temperature of 60° C. or lower, and a maximum heat shrinkage rate at 60° C. of 2% or more. 
     
     
       7. The molded product of  claim 4 , wherein the molded product has a maximum heat shrinkage rate at 85° C. of 50% or more. 
     
     
       8. The molded product of  claim 5 , wherein the heat-shrinking film has a glass transition temperature in the range of from 59° C. to 70° C. 
     
     
       9. The molded product of  claim 5 , wherein the heat-shrinking film has a glass transition temperature in the range of from 59° C. to 64° C. 
     
     
       10. The molded product of  claim 5 , wherein the heat-shrinking film has a glass transition temperature in the range of from 64° C. to 70° C. 
     
     
       11. The copolymer resin of  claim 1 , wherein m is 4 or 5. 
     
     
       12. The copolymer resin of  claim 1 , wherein the copolymer resin consists of the 1,4-cyclohexane dimethanol, the cyclohexane dimethanol based compound of Formula 1, the ethylene glycol, the aromatic dicarboxylic acid, a polycondensation catalyst, a phosphorus-based stabilizer, and a coloring agent.